Agree with Francis above WRT looking for bent blades. But I'll add that what really counts is the straightness/alignment of the fork, not whether the rake is less but otherwise the fork is straight. A fork that is offset to one side will affect the tracking (no handed riding) of a bike (assuming the rest of the system/bike isn't also off). But a twisted or bent back fork need not be offset to one side. So my biggest goal when aligning forks is to get the wheel aligned with the steerer. Next is having the axle parallel to the crown, but this isn't truly needed for a straight fork. Last is the blades' upper sections (the portions that are not raked) being in line with the steerer.

I find that these two last aspects is very easy to see, and therefore to dwell on. But not all that important to a straight steering bike. It's the first aspect, the wheel/rim being inline with the steerer, that's most important but the hardest for most to see. Andy.